Multiple Inheritance in C++ vs Python: Diamond Problem Resolved

The Diamond Problem occurs in languages that support multiple inheritance. If Class B and Class C both inherit from Class A, and Class D inherits from both B and C, a conflict arises when D calls an overridden method originally defined in A.

C++ resolves this by using the virtual keyword during inheritance, ensuring only a single instance of the grandfather class (A) exists in memory.

class A { public: virtual void show() {} };
class B : virtual public A {};
class C : virtual public A {};
class D : public B, public C {};

Python resolves this automatically using Method Resolution Order (MRO) calculated via the C3 Linearization algorithm. You can check any class's search path using Class.__mro__:

class A: pass
class B(A): pass
class C(A): pass
class D(B, C): pass

print(D.__mro__)
# Output: (D, B, C, A, object)